Boiler-circulator.



A,MCNA& BolLER cmcuLAToR.

APPLICATION FILED NOV. 19. i914.`

1,155,832. Patented Oct. 5, 1915.

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A. NICNAB.

BOILER CIRCULATOR.

APPLICATION FILED NOV. I9. |914.

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Patented Oct. 5, 1915.

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BOILER CIRCULATOR.

APPLICATION FILED Nov. I9. |914.

1.155,882. Patented OCI. 5, 1915.

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'IIIIIIIII miren sfrarns Parana serien ALEXANDER'MeNAB, orl BRIDCEPQRT,CONNECTICUT, ,AssIGNoR To THE ivroNAB COMPANY, OF BRIDGEPORT,CONNECTICUT, A CORPORATION OF CONNECTICUT.

:BoILER-CIRCULerma.`

To all whom t may concern .v'

Be it known that I, ALEXANDER MCNAB, a subject of the King of England,residing yat the city of Bridgeport, county of Fairfield, State ofConnecticut, United States of America, have invented certain new anduseful Improvements in Boiler-Circulators; and'l do declare thefollowing to be a full, clear, and eXact description "of the invention,such as will enable others skilled in the art tofwhich it appertains tomake and use the same.

This invention relates to Certain new and useful improvements 1nautomatic circulator for steam boiler. land the primary. object Vthereofis to provide a circulatoi' in which Still further, the invention aimsto pro:-.

vide a circulator which has novel nozzle means incorporated therein toassist in rapid fiow and deflection of the water.

Other and further objects will be later set forth in the course of thefollowing description.

ln the drawings: Figure 1 is a section on the line 1 1 of Fig. 2; Fig. 2is a section on the line 2-2 of Fig. 1; Fig. 3 is an enlarged detailview showing the vanes and the deflector nozzles at the top of the firetubes; Fig. 4l is a similar view of the vanes at the bottoms of the firetubes; and Fig. 5 is a top plan view of Fig. i.

ln proceeding in accordance with the present inveniton, pairs of upperand lower side plates 1 are employed, which extend longitudinally of theboiler and are secured to the fire tubes by the provision o-f anglebrackets 2 which are bolted or riveted to thev plates 1 and haveperforations formed in their horizontal parts, through which perforations, hook bolts 3 pass, the hooks i of which bolts engage the firetubes T, while nuts 5 are threaded on the bolts 3 and imspeeification ofLetters Patent.

pinge againstthe lugs2, so as to draw the hooks et tightly intoengagement with the tubes T.

Thesideplatesl are connected by the bladesor vanes 6, which blades orvanes have their Aends turned at right angles at 7 and riveted lto therespective side plates 1 so that the blades are stationarily or rigidlyaffixed to the side plates 1.

lt, will be noted that inthe present em-V bodiment of the inventionthere are six blad'es'or vanes 6 at the tops and at the bottoms of thebanks of fire tubes, the blades at the lower ends of the tubesinclining. rearwardly of the boilerV while the blades at the tops ,oflthe tubes incline toward the front Aof the boiler, whichoppositeinclination of the bladesis for the purpose of causing the water totravel in the path indicated bythe arrows in Fig. 2.,v e I ,i

The alternate blades at the tops ofthe Patented Oct. 5, 1915. 1Application filed November 19, 1914. Serial No. 872,938.

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tubes are provided with forwardly projectt .ing horizontal portions S,the spaces 9 between adjacent portions 8 constituting noz;

zles, the nozzles being arranged in superposed order for the purpose ofdirecting the v boiling water toward thev front yof the boiler. As shownin Figs. 2 and 3 the nozzles 9 provide independent passages for thewater, or in other words the nozzles perform the function of dividingthe boiling water into upper and lower stratal to assist in increasingthe rapidity of the flow of the water. The nozzles are arranged so thatthe one next to the fire tubes is nearest the boiler front, or in otherwords the nozzles are arranged in step-like order. l

It will also be noted from the drawings that the longitudinal side edgesof the blades adjacent to the tubes T Contact with the latter so thatibytightening the nuts on the bolts 3 the blades may be easily and quicklyapplied to or removed from the tubes, and

since the blades rigidly connect the side plates 1 it will be apparentthat a unitary and rigid structure is provided which can be easily movedback and forth on the tubes for the purpose of cleaningv the latter.-v

Referring to Figs. 1 and 2 of the drawings it will be seen that atransverse deflecting element here shown as formed in two sections 9a issecured to the back 10 of the boiler casing by rivets 11 and has ahorizontal forwardly projecting portion 1-2 secured by means of hookbolts 13 to the boiler braces 14. rlhis element extends entirely acrossthe boiler and serves to assist in deliecting lthe water toward theboiler front.

1t will be observed that in the present case, since each of the blades 6has a longitudinal edge engaging the tubes, that a most firm andsubstantial foundation or anchorage for the structure is provided. The

blades in proxnnity to the combustion chainber are arranged in closerrelation to each other than are the blades more remotely situated withrespect to the combustion chamber.

The operation briefly summarized is as follows: As the water is heatedit rapidly rises upwardly and iinpinges against the lower set of bladesand is deflected by the latter toward the rear of the boiler, the watercontinuing to rise until it engages the upper set of blades and isdeiected by the latter toward the front of the boiler, whereupon thewater will descend and again pursue the course o'f travelaforementioned. rlhe close relation of the blades as the combustionchamber is approached results from the fact that the heat is moreintense adjacent said chamber and therefore the upward eurrent of thewater is proportionately accelerated and requires deflectionaccordingly. At the front of the boiler where the heat is of lessdegree, the water is comparatively sluggish and isv readily influencedby the rapidly moving hot currents, which there-- fore allows the bladesto be more widely spaced.

What is claimed is:

l. In a boiler circulator, a pairoof spaced Copies of this patent may beobtained for side plates, and blades rigidly connected at their ends tothe side plates and formed at their upper portions into horizontallyextending nozzles.

2. In a boiler circulator, a series of spaced blades adapted to betransversely arranged with respect to the boiler tubes, some of saidblades having their upper portions formed into horizontally extendinggradient nozzles.

3. in a boiler circulator, a series of spaced blades adapted to betransversely arranged with respect to the boiler tubes, some of saidblades being formed into nozzle portions which latter extend inhorizontal successively overlapping relation to form superposed waterpassages.

a. In a boiler circulator, a series of blades, and a forward horizontalextension on alternate blades, said extensions forming superposednozzles.

. ln a boiler circulator, blades forming assaOes and horizontallextendino' nozzles overlying the passages and communicating therewith.

6. ln a boiler cireulator, spaced side plates, and a series oftransverse inclined blades rigidly connected at their ends to saidplates, the distance between said blades gradually increasing as theyapproach the outer wall of the boiler.

ln testimony whereof I ailix my signature in presence of two witnesses.

ALEXANDER Merian.

Vitnesses F. W. SnrrH, Jr., M. T. LONGDEN.

five cents each, by addressing the Commissioner of Patents,

Washington, D. G.

